- Women of childbearing potential (WOCBP) must agree to use an effective form of birth control for the duration of the study (abstinence, stabilized on oral contraceptives or contraceptive patches for at least three months, implant, injection, intrauterine device, NuvaRing®, condom and spermicidal or diaphragm and spermicidal). Abstinence is an acceptable form of birth control for subjects who are not sexually active. Subjects that become sexually active during the trial must agree to use an effective, non-prohibited form of birth control for the duration of the study.